Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Duluth you can determine when it's a good idea to plant sweet woodruff by checking out the USDA zone info.

Planting Calendar for Sweet Woodruff

Frost tolerance for sweet woodruff:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Sweet Woodruff tend to make it in moderate cold which means that you can plant them just a bit earlier in the year than other frost tender plants.

The earliest that you can plant sweet woodruff in Duluth is March. However, you really should wait until April if you don't want to take any chances.

The last month that you can plant sweet woodruff and expect a good harvest is probably August. You probably don't want to wait any later than that or else your sweet woodruff may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your sweet woodruff indoors.

Last Frost Date

The average date of last frost is May 15 in Duluth. In the coldest months of winter you should expect an average low temperature of -30°F.

Since the USDA zone info for Duluth is just an average the actual date of last frost changes from year to year. Half of the time in Duluth last frost occurs after May 15 so make sure that you are ready to protect your sweet woodruff in the event of a late frost.

USDA Zone Info for Duluth

Here is the info for USDA Zone 4a.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-30°F
Highest Expected Low	-25°F

This means that on a really cold year, the coldest it will get is -30°F. On most years you should be prepared to experience lows near -25°F.

Plants to Grow in Duluth

You may be interested in your other planting guides for Duluth.